diff --git a/docshell/base/nsDocShell.cpp b/docshell/base/nsDocShell.cpp
index 0ad33fe91d99..923ec8248b48 100644
--- a/docshell/base/nsDocShell.cpp
+++ b/docshell/base/nsDocShell.cpp
@@ -5500,7 +5500,10 @@ nsDocShell::GetCurrentDocumentOwner(nsISupports ** aOwner)
     }
 
     //-- Get the document's principal
-    *aOwner = document->GetPrincipal();
+    if (document) {
+        *aOwner = document->GetPrincipal();
+    }
+
     NS_IF_ADDREF(*aOwner);
 }